Not able to read string attribute from dataset

[mghh]

What are you trying to do?

I try to read a string attribute from a dataset.

What did you do?

Here is a code snippet:

    var version int64
    versionAttr, _ := dset.OpenAttribute("version")
    versionAttr.Read(&version, hdf5.T_STD_U64LE)
    fmt.Println(version)

    var start string
    startAttr, _ := dset.OpenAttribute("start")
    startAttr.Read(&start, hdf5.T_GO_STRING)
    fmt.Println(start)

Reading the version attribute is fine. Reading the 'start' attribute results in empty string.
Here the snippet from h5dump:

      ATTRIBUTE "start" {
         DATATYPE  H5T_STRING {
            STRSIZE H5T_VARIABLE;
            STRPAD H5T_STR_NULLTERM;
            CSET H5T_CSET_UTF8;
            CTYPE H5T_C_S1;
         }
         DATASPACE  SCALAR
         DATA {
         (0): "2018-09-04T02:27:43"
         }
      }
      ATTRIBUTE "version" {
         DATATYPE  H5T_STD_I64LE
         DATASPACE  SCALAR
         DATA {
         (0): 1
         }
      }

What did you expect to happen?

I am excepting a variable start with this content "2018-09-04T02:27:43".

What actually happened?

What version of Go, Gonum, Gonum/netlib and libhdf5 are you using?

go:
hdf5: master (c257073)

Problem occurs either with libhdf5: 1.8.20 and libhdf5: 1.10.2

Does this issue reproduce with the current master?

yes.